[_ck_]

Dumb question: What should I add to post.php?

Nothing. My version of this plugin requires absolutely no template or core edits. It’s why I made it

It’s optional to put the style in your style.css to prevent an extra stylesheet but that’s trivial and not necessary.

Note that I’ve turned on the default options of “one signature per user per page” and “only moderators and above can have signatures”. You can edit this in the plugin (change “moderate” to “participate”)

There are still many, many things not checked in this, like they could trick it to post 100 lines in a signature or use a HUGE image if you have “allow images” installed. This for now comes down to moderators doing their job.